The People's Republic of China textile industry standard non-woven standard method A refers to the international standard ISO 9073-4-1989 "Textiles - Nonwovens Test Methods - Part 4: Determination of Tear Resistance".
1 Subject content and scope of application This standard specifies two methods for determining the tear strength of nonwoven fabrics, A method - trapezoid method, B method - drop hammer method.
Method A - The trapezoid method is applicable to all kinds of nonwoven fabrics.
The B method-drop weight method is only applicable to the measurement of the tearing strength of a thin nonwoven fabric having a mass of 120 g/m 2 or less.
2 Reference standard
Standard atmosphere for humidity control and test of GB 6529 textiles
GB 8170 numerical rounding rules
3 A method - trapezoidal method
3.1 Principle A strip sample with a trapezoidal shape will be drawn, and a slit of a certain length will be cut in the trapezoidal short side as the starting point of the tear, and then the trapezoidal sample will be clamped along the clamping line to the upper and lower clamps of the strength testing machine. Within the jaws, a continuously increasing load is applied to the sample, causing the sample to tear along the slit and gradually expand until the sample is completely torn.
3.2 Instrument
3.2.1 The constant velocity traction type (CRT) strength testing machine can be used, and the constant velocity elongation type (CRE) strength testing machine can also be used. In the case of an arbitration test or in the event of a dispute, the CRE type shall prevail.
3.2.2 The clamps holding the specimens shall have sufficient width to allow the width of the specimen to be fully clamped. During the test, the specimen shall not slip in the jaws.
3.3 There shall be no obvious creases and defects on the sampled samples that affect the quality of the test. Samples shall be taken at a distance of more than 1 m from the end of the cloth, and each sample shall be cut to a length of 1 m.
3.4 Preparation of samples
3.4.1 Remove 100mm from the edge of the sample and cut 10 longitudinal and transverse specimens in parallel. Generally, it can be cut more than the prescribed number for spare.
3.4.2 Size of the sample: first cut into strips with a width of 50mm and a length of not less than 200mm.
3.4.3 Use a trapezoidal template (the size of which is shown in Figure 1) to draw a trapezoidal beveled edge on the strip, ie, the gripping line, and at the center of the short side of the trapezoid, cut a length of 10 mm perpendicular to the short side. Incision.
3.5 Conditioning and testing of samples The standard atmosphere shall be pre-conditioned and humidity-conditioned according to GB 6529.
The test is carried out in the standard atmosphere specified in GB 6529, and the arbitrage test uses a secondary standard atmosphere.
3.6 Test procedure
3.6.1 Correct the gap between the upper and lower clamps by 100±1mm before testing.
3.6.2 Adjust the traction speed of the lower clamp to 100mm/min.
3.6.3 Pre-test: Select the tensile force range of the strong test machine so that the maximum value of the tear strength falls between 20% and 80% of the full scale (the constant-speed Elongation CRE test machine is not subject to this limit).
3.6.4 Formal test: Place the sample in the upper and lower clamps so that the clamping line is flush with the clamp jaw line, then tighten the upper and lower clamp screws, and pay attention to the sample in the middle of the upper and lower clamps. The symmetrical position, so that the short side of the trapezoidal sample is kept in a vertical state, and finally the strength tester is started, and the sample is completely torn, and the maximum tear strength value is recorded.
3.6.5 If the specimen slips in the jaws if the clamp screw is not tightened during the test, the test data should be excluded. Due to the difference in the manufacturing process, there may be some irregularities in the longitudinal and transverse tearing directions during the test. In case of such abnormal conditions, it should be indicated in the test report.
3.7 The results represent the average of the maximum values ​​of tear strength in the longitudinal and transverse directions, in Newtons (N), calculated to two decimal places, and one decimal place after revision according to GB 8170.
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